01 -
Get your oven hot at 350°F and give a 9 x 13 inch baking dish a light spray of cooking oil.
02 -
Mix flour, baking soda, salt, and cinnamon in a medium bowl until they're all well combined.
03 -
In a bigger bowl, whip the butter with both brown and white sugars until the mix looks pale and fluffy.
04 -
Drop in eggs one by one, mixing well after each one, then stir in the vanilla.
05 -
Slowly add your flour mix to the wet stuff, stirring just enough to mix them together.
06 -
Gently mix in the oats and chocolate chips until they're spread throughout the batter.
07 -
Pour the batter into your greased pan and bake for 30 to 45 minutes until the top turns golden and the middle feels firm.
08 -
Let the bars cool down in the pan before you cut them into pieces.